Component Description

Hydraulic System - 6F35

Component Description

Transmission Pump and Fluid Filter

The transmission fluid in the sump area at the bottom of the transaxle case flows through a transmission fluid filter to the pump assembly. The pump is bolted to the torque converter housing and is driven by the torque converter hub.










Main Control

The hydraulic system has a main control assembly. The main control assembly consists of a valve body and a solenoid body. Both the valve body and the solenoid body contain hydraulic shift valves. The solenoid body contains the shift solenoids that control the hydraulic valves. The solenoid body can be serviced as an assembly with the solenoids or the solenoids can be serviced individually. The solenoid body is controlled by the TCM (Transmission Control Module). The TCM (Transmission Control Module) has software stored in it specific to the solenoid body currently in the transmission, called the solenoid body strategy. A new solenoid body strategy must be downloaded into the TCM (Transmission Control Module) anytime a new solenoid body is installed.

The pump assembly contains the main pressure regulator valve assembly and the TCC (Torque Converter Clutch) control valve assembly.

Main Control Components










Main Control Valve Body










Solenoid Body














Multi-Plate Clutch

Multi-plate clutches are clutches that consist of multiple friction and steel clutch discs that when pressure is applied, either drive or hold (brake) components of the planetary gearset. This transmission has 5 multi-plate clutches:
- Forward (1,2,3,4)
- Direct (3,5,R)
- Intermediate (2,6)
- Overdrive (4,5,6)
- Low/reverse

Both the direct (3,5,R) and the overdrive (4,5,6) clutches are drive clutches. The direct (3,5,R) clutch drives the rear planetary sun gear and the overdrive (4,5,6) clutch drives the rear planetary carrier. The forward (1,2,3.4), intermediate (2,6) and the low/reverse clutches are brake clutches. The forward (1,2,3,4) clutch holds the front sun gear, the intermediate (2,6) clutch holds the rear sun gear and the low/reverse clutch holds the rear planetary carrier.

Clutches; overdrive (4,5,6) and direct (3,5,R) are balanced in terms of dynamic pressure. That is, their pistons are exposed to the transmission fluid flow on both sides to prevent pressure buildup in the clutch as speed increases. This dynamic pressure equalization process is achieved by a baffle plate and pressure-free transmission fluid supply by a lubricating passage, through which the space between the piston and baffle plate is filled with transmission fluid.

The advantages of this dynamic pressure equalization are:
- reliable clutch engagement and release in all speed ranges.
- improved shift refinement.

External sealing

The torque converter housing has a lip-type seal that seals the torque converter hub. The pump assembly seals to the torque converter housing with a rubber seal. The manual shaft and halfshafts also use lip-type seals.

The torque converter housing is sealed to the transmission case with silicone sealant.

The main control cover is sealed to the transmission case with silicone sealant and seals to the solenoid body with a reusable rubber gasket. The TSS (Turbine Shaft Speed) sensor is sealed to the transmission case with an O-ring seal.

The line pressure tap plug and transmission fluid drain plug have pipe threads and seal when tightened to specification.










Hydraulic Circuits Legend





Line Pressure Hydraulic Circuits

Line pressure is controlled by the LPC (Line Pressure Control) solenoid, which is controlled by the TCM (Transmission Control Module). This effects shift feel and apply component operation.

When the engine is running, the pump supplies pressure to the main pressure regulator valve, which is controlled by the LPC (Line Pressure Control) solenoid. The main pressure regulator valve controls the line pressure to the LINE circuit which supplies the manual valve solenoid regulator valve and the control pressure regulator valve.

When the manual valve is in the reverse position, it supplies the clutch control bypass valve with line pressure to position it to supply line pressure to the direct (3, 5, R) regulator valve and regulated line pressure to the low/reverse clutch to apply the clutch.

When the manual valve is in the DRIVE or LOW positions, it directs line pressure from the LINE circuit to the DRIVE circuit to supply line pressure to the:
- Clutch control bypass valve
- Forward (1, 2, 3, 4) regulator valve
- Intermediate (2, 6) regulator valve
- TCC (Torque Converter Clutch) regulator valve
- Direct (3, 5, R) clutch regulator valve





Solenoid Hydraulic Circuits

Line pressure from the main pressure regulator valve is directed to the individual shift, TCC (Torque Converter Clutch) and LPC (Line Pressure Control) solenoids by the solenoid regulator valve through the SOL FD circuit. The solenoids, controlled by the TCM (Transmission Control Module), direct the fluid to the valves that they control.

The LPC (Line Pressure Control) solenoid sends varying pressure to the line pressure regulator valve to control line pressure.





Forward Clutch Hydraulic Circuits

Line pressure is supplied to the 1234 regulator valve by the manual valve in the DRIVE and LOW position. To apply the forward (1, 2, 3, 4) clutch, SSA (Shift Solenoid A) supplies varying solenoid pressure to the 1234 regulator and latch valves. As the regulator valve moves, it supplies the forward (1, 2, 3, 4) clutch and 1234 latch valve with regulated line pressure through the C1234 circuit. The 1234 latch valve directs the regulated line pressure to the opposite side of the 1234 regulator valve through the C1234 FDBK circuit for gradual forward (1, 2, 3, 4) clutch engagement. The forward (1, 2, 3, 4) clutch is applied in 1st, 2nd, 3rd and 4th gears and manual LOW position.





When the forward (1, 2, 3, 4) clutch is released in 5th and 6th gears, solenoid pressure from SSA (Shift Solenoid A) is removed from the 1234 regulator and latch valves which positions the valves to block line pressure and release the forward (1, 2, 3, 4) clutch. When the forward (1, 2, 3, 4) clutch is released in the PARK, REVERSE or NEUTRAL position, line pressure is not supplied to the forward (1, 2, 3, 4) regulator valve.

In the released position, exhaust backfill supplied to the 1234 regulator and latch valves by the manual valve through the EXH BF circuit is directed to the forward (1, 2, 3, 4) clutch to fill the unused circuits with unpressurized transmission fluid.





Direct (3, 5, R) Clutch Hydraulic Circuits

When the direct (3, 5, R) clutch is applied in REVERSE, LINE pressure from the pump is directed to the multiplex manual valve by the manual valve through the REV hydraulic circuit. The multiplex manual valve supplies the direct (3, 5, R) clutch regulator valve with pressure through the REV SUPPLY and C35R SUPPLY hydraulic circuits. To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) applies varying solenoid pressure to the C35R clutch regulator and boost valves. As the C35R regulator valve moves, it supplies the direct (3, 5, R) clutch and C35R boost valve with regulated line pressure through the C35R circuit. The C35R boost valve directs the regulated line pressure to the opposite side of the C35R clutch regulator valve through the C35R FDBK circuit for controlled direct (3, 5, R) clutch engagement.





When the direct (3, 5, R) clutch is applied in 3rd and 5th gear, line pressure from the pump is directed to the clutch control bypass valve by the manual valve through the DRIVE hydraulic circuit. The clutch control bypass valve directs the pressure to the 35R regulator valve through the TCC (Torque Converter Clutch) regulator valve, DRIVE 2 circuit, DRIVE 2/C35R FD shuttle ball and DRIVE 2/C35R FD circuit.

To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) applies varying solenoid pressure to the 35R regulator and latch valves. As the 35R regulator valve moves, it supplies the direct (3, 5, R) clutch and 35R latch valve with regulated line pressure through the C35R circuit. The 35R latch valve directs the regulated line pressure to the opposite side of the regulator valve through the C35R FDBK circuit for gradual direct (3, 5, R) clutch engagement.





When the direct (3, 5, R) clutch is released, solenoid pressure from SSB (Shift Solenoid B) is removed from the 35R regulator and latch valves which positions the valves to block line pressure and release the direct (3, 5, R) clutch. When the direct (3, 5, R) clutch is released in the PARK or NEUTRAL position, line pressure is not supplied to the 35R regulator valve.

Compensator feed pressure is supplied to the 35R regulator valve from the control pressure regulator through the COMP FD circuit and is supplied to the opposite side of the direct (3, 5, R) and O/D (Overdrive) (4, 5, 6) clutch pistons to keep the clutches from centrifugally applying. COMP FD pressure is only about 83 kPa (12 psi) and is applied through all gears. When the direct (3, 5, R) clutch is released, COMP FD is applied by the 35R regulator valve to the direct (3, 5, R) clutch to fill the unused circuits.





Intermediate (2, 6) Clutch Hydraulic Circuits

Line pressure is supplied to the 26 regulator valve by the manual valve in the DRIVE and LOW positions. To apply the intermediate (2, 6) clutch, SSC (Shift Solenoid C) supplies varying solenoid pressure to the 26 regulator and latch valves. As the 26 regulator valve moves, it supplies the intermediate (2, 6) clutch and 26 latch valve with regulated line pressure through the CB26 circuit. The 26 latch valve directs the regulated line pressure to the opposite side of the 26 regulator valve through the CB26 FDBK circuit for gradual intermediate (2, 6) clutch engagement. The intermediate (2, 6) clutch is applied in 2nd and 6th gears.





When the intermediate (2, 6) clutch is released in 1st, 3rd, 4th and 5th gears and manual LOW position, solenoid pressure from SSC (Shift Solenoid C) is removed from the 26 regulator and latch valves which positions the valves to block line pressure and release the intermediate (2, 6) clutch. When the intermediate (2, 6) clutch is released in the PARK, REVERSE or NEUTRAL position, line pressure is not supplied to the 26 regulator valve.

In the released position, exhaust backfill supplied to the 26 clutch regulator valve by the manual valve through the EXH BF circuit is directed to the intermediate (2, 6) clutch and 26 latch valve to fill the unused circuits with unpressurized transmission fluid.





Low - Reverse Clutch Hydraulic Circuits

To apply the low/reverse clutch, SSD (Shift Solenoid D) supplies varying solenoid pressure to the low reverse/456 regulator and latch valves. As the low reverse/456 regulator valve moves, it supplies the clutch control bypass valve and low reverse/456 latch valve with regulated line pressure through the CBR1/C456 circuit. The low reverse/456 latch valve directs the regulated line pressure to the opposite side of the 456 regulator valve through the CBR1/C456 FDBK circuit for gradual low reverse/456 clutch engagement. The low/reverse clutch is applied in PARK, REVERSE, NEUTRAL, 1st gear below 8 km/h (5 mph) and manual LOW position.

In REVERSE, both solenoid pressure from ON/OFF SSE (Shift Solenoid E) and line pressure from the manual valve in the REVERSE circuit apply pressure to the clutch control bypass valve to position it for low/ reverse clutch application. Regulated line pressure from the CBR1/C456 circuit is directed to the low/ reverse clutch by the clutch control bypass valve through the CBR1 circuit to apply the low/reverse clutch.





When the low/reverse clutch is applied in PARK, NEUTRAL, LOW or 1st gear below 8 km/h (5 mph), only pressure from ON/OFF SSE (Shift Solenoid E), positions the clutch control bypass valve. Line pressure from the REVERSE circuit is not supplied by the manual valve.





When the low/reverse clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, solenoid pressure from SSD (Shift Solenoid D) is removed from the low reverse/456 regulator and latch valves which positions the valves to block line pressure and release the low/reverse clutch. Solenoid pressure from SSE (Shift Solenoid E) is removed from the clutch control bypass valve to position it to apply the O/D (Overdrive) (4, 5, 6) clutch.

When the low/reverse clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, exhaust backfill supplied to the low reverse/456 clutch regulator valve and the clutch control bypass valve by the manual valve through the EXH BF circuit is directed to the low reverse/456 latch valve, low/reverse clutch and O/D (Overdrive) (4, 5, 6) clutch to fill the unused circuits with unpressurized transmission fluid.

When the low/reverse clutch is released in 4th, 5th and 6th gears, the low reverse/456 regulator valve supplies regulated pressure to the clutch control bypass valve through the CBR1/C456 circuit. With ON/ OFF SSE (Shift Solenoid E) in the OFF position, the regulated pressure is directed to the O/D (Overdrive) (4, 5, 6) clutch.





Overdrive Clutch Hydraulic Circuits

Line pressure is supplied to the low reverse/456 regulator valve by the pump in every gear and manual lever position. To apply the low/reverse clutch, SSD (Shift Solenoid D) supplies varying solenoid pressure to the low reverse/456 regulator and latch valves. As the regulator valve moves, it supplies the clutch control bypass valve and low reverse/456 latch valve with regulated line pressure through the CBR1/C456 circuit. The low reverse/456 latch valve directs the regulated line pressure to the opposite side of the low reverse/456 regulator valve through the CBR1/C456 FDBK circuit for gradual O/D (Overdrive) (4, 5, 6) clutch engagement.

To apply the O/D (Overdrive) (4, 5, 6) clutch, the position of the clutch control bypass valve allows the regulated line pressure in the CBR1/C456 circuit to supply the C456 circuit, applying the O/D (Overdrive) (4, 5, 6) clutch. Clutch control bypass valve latch pressure is supplied by the C456 circuit. The O/D (Overdrive) (4, 5, 6) clutch is applied in 4th, 5th and 6th gears.





When the O/D (Overdrive) (4, 5, 6) clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, solenoid pressure from SSD (Shift Solenoid D) is removed from the low reverse/456 regulator and latch valves which positions the valves to block line pressure and release the O/D (Overdrive) (4, 5, 6) clutch.

When the O/D (Overdrive) (4, 5, 6) clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, exhaust backfill supplied to the low reverse/456 clutch regulator valve and the clutch control bypass valve by the manual valve through the EXH BF circuit is directed to the low reverses latch valve, low/ reverse clutch and O/D (Overdrive) (4, 5, 6) clutch to fill the unused circuits with unpressurized transmission fluid.

When the O/D (Overdrive) (4, 5, 6) clutch is released in PARK, REVERSE, NEUTRAL and 1st gear below 8 km/h (5 mph), the low reverse/456 regulator valve supplies regulated pressure to the clutch control bypass valve through the CBR1/C456 circuit. With ON/OFF SSE (Shift Solenoid E) in the ON position, the regulated pressure is directed to the low/reverse clutch.